arm: move CONFIG_TFABOOT to generic Kconfig

Currently, CONFIG_TFABOOT is located in armv8/fsl-layerscape Kconfig,
but it will be also useful for other targets if some additional
configuration are necessary.
So move it to arch/arm/Kconfig.

Please note that CONFIG_TFABOOT still depends on
CONFIG_ARCH_SUPPORT_TFABOOT and so the menu won't come up
if any target doesn't need its own customization for TF-A boot.
This will maintain the compatibility.

Signed-off-by: AKASHI Takahiro <[email protected]>
Cc: Rajesh Bhagat <[email protected]>
Cc: York Sun <[email protected]>
Cc: Prabhakar Kushwaha <[email protected]>
Cc: Priyanka Jain <[email protected]>
Cc: Sriram Dash <[email protected]>
Cc: Hou Zhiqiang <[email protected]>
Cc: Peng Ma <[email protected]>
Cc: Yuantian Tang <[email protected]>
Cc: Pankit Garg <[email protected]>

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